Constant TFD_TIMER_ABSTIME

pub const TFD_TIMER_ABSTIME: i32 = _; // 1i32

Available on crate feature dep_nc only.

CAREFUL: Check include/asm-generic/fcntl.h when defining new flags, since they might collide with O_* ones.

We want to re-use O_* flags that couldn’t possibly have a meaning from eventfd, in order to leave a free define-space for shared O_* flags.